Method for recovering medium-concentration and low-concentration vanadium in industrial sewage resulted from stone coal vanadium extraction

A technology of industrial wastewater and recovery method is applied in the field of recovery of low-concentration vanadium in industrial wastewater of vanadium extraction from stone coal, and achieves the effects of alleviating environmental pollution, reducing concentration, and reducing the concentration of vanadium.

Inactive Publication Date: 2012-12-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Although the adsorption method can recover vanadium in wastewater, it still has the disadvantages of unsatisfactory treatment effect and high operating cost; chemical precipitation method has been applied in engineering to some extent, but this wastewater treatment method is prone to corrosion and passivation, thus Affect the stability of water purification effect
In addition, when this method is used to treat high-concentration vanadium-containing wastewater, the treatment effect is unstable, causing secondary pollution, high operating costs, and the vanadium in the wastewater cannot be effectively recycled. Although ion exchange can recover vanadium, the treatment effect is relatively stable, but The disadvantage is that the amount of ion exchange resin is large, the regeneration is frequent, and the treatment cost is high.

Method used

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  • Method for recovering medium-concentration and low-concentration vanadium in industrial sewage resulted from stone coal vanadium extraction

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Take 100ml of waste water for extracting vanadium from stone coal with a vanadium ion concentration of 1mg / L, add 0.05mg of sodium chlorate to oxidize the low-valent vanadium in the solution to pentavalent vanadium. Adjust the pH value of the solution to 3.0 with ammonia water with a mass fraction of 18-25%, add 3ml TritonX-114, place it in a 45°C water bath and heat for 10min to fully dissolve it. Centrifuge the phases in a centrifuge for 10 minutes while it is hot, and the vanadium ions are enriched in the micellar phase of the surfactant. Add 5ml of sulfuric acid solution with a mass fraction of 10% to the surfactant micelles that come out after phase separation, and heat to 45°C in a water bath again to fully dissolve it. The phases were separated by centrifugation for 10 min while hot. The recovery rate of vanadium was 91.6%. The vanadium-containing enrichment solution obtained by stripping can be returned to the vanadium extraction and leaching process of stone ...

example 2

[0030] Get 100ml of vanadium-extracting wastewater from stone coal containing 5mg / L of vanadium, add 0.17mg of sodium chlorate to oxidize the low-valent vanadium in the solution to pentavalent vanadium. Adjust the pH value of the solution to 3.0 with a mass fraction of 18-25%, add 4ml TritonX-114, place in a 50°C water bath and heat for 15min to fully dissolve it. Centrifuge the phases in a centrifuge for 15 minutes while hot, and the vanadium ions are enriched in the micellar phase of the surfactant. Add 5ml of sulfuric acid solution with a mass fraction of 10% to the surfactant micelles after phase separation, and heat to 50°C in a water bath again to fully dissolve it. The phases were separated by centrifugation for 15 min while hot. The recovery rate of vanadium was 82.1%. The vanadium-containing enrichment solution obtained by stripping can be returned to the vanadium extraction and leaching process of stone coal, and the separated surfactant can be recycled.

example 3

[0032] Take 100ml of vanadium-extracting wastewater from stone coal containing 10mg / L of vanadium, add 0.40mg of sodium hypochlorite to oxidize the low-valent vanadium in the solution to pentavalent vanadium. Adjust the pH value of the solution to 3.5 by using ammonia water with a mass fraction of 18-25%, add 5ml TritonX-114, place it in a water bath at 60°C and heat it for 20min to fully dissolve it. Centrifuge the phases in a centrifuge for 15 minutes while hot, and the vanadium ions are enriched in the micellar phase of the surfactant. Add 5ml of sulfuric acid solution with a mass fraction of 10% to the surfactant micelles after phase separation, and heat to 60° C. in a water bath again to fully dissolve it. The phases were separated by centrifugation for 15 min while hot. The recovery rate of vanadium is 76.1.3%. The vanadium-containing enrichment solution obtained by stripping can be returned to the vanadium extraction and leaching process of stone coal, and the separat...

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Abstract

The invention relates to a new method for recovering medium-concentration and low-concentration vanadium in industrial sewage resulted from stone coal vanadium extraction, belonging to the technical field of metallurgy and engineering chemistry. The method comprises the steps of oxidization, pH value adjustment, extraction of non-ionic surfactant Triton X-114, back extraction of sulfuric acid solution, and the like. The method is mainly and technically characterized in that the non-ionic surfactant Triton X-114 is used for extraction, the cloud point phenomenon of the surfactant is taken as the basis, hydrophobic substances are separated from hydrotropic substances by changing technical parameters (such as pH value of the solution, temperature, and the like), the vanadium in the sewage can be effectively recovered, and the surfactant after the back extraction can be cyclically used. The method has the advantages of small use amount of reagent, fast extraction and separation, low cost, no secondary pollution, and the like, and can be widely used for treating vanadium-containing industrial sewage.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and more specifically relates to a method for recovering low-concentration vanadium in industrial wastewater for extracting vanadium from stone coal. Background technique [0002] The stone coal acid leaching vanadium extraction process uses sulfuric acid solution to leach the vanadium in the stone coal. After the vanadium-containing acid leaching solution is purified, neutralized and extracted, a large amount of waste water containing low concentration of vanadium is produced. For example, an acid leaching-extraction wet vanadium extraction plant with an annual output of 1,200 tons discharges about 3.2×10 of low-concentration vanadium-containing wastewater every year. 6 m 3 . If the waste water is discharged directly, it will not only seriously pollute the environment, but also waste a large amount of recyclable vanadium resources. With the gradual expansion of the v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B34/22
CPCY02P10/20
Inventor 魏昶李存兄樊刚李兴彬
Owner KUNMING UNIV OF SCI & TECH
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